[hultner]

I can recommend this path, studied almost all my pre-engineering math this way 2011 and were better equipped for initial engineering courses then most of my peers. However it kinda capped out at high-school level (or atleast Swedish equivalents).

[KodiakLabs]

Interesting. Truth be told, I remember when it was simply him on YouTube. I guess to carry on, one would have to go for 3Blue1Brown to get the fundamentals of university math.